Include an additional counter in the MySQL result set

Question

Can I include an additional counter in a MySQL result set? I have the following query which gives me two columns back. I need an additional column (only in the result) indicating the row of each line in the result set.

select orderid, round(sum(unitprice * quantity),2) as value
from order_details
group by orderid
order by 2 desc
limit 10

I need something like the following:

10865 1 17250.00
11030 2 16321.90
10981 3 15810.00
10372 4 12281.20
10424 5 11493.20

Answer 1

Try this:

SET @counter = 0; 
Select sub.*
FROM
(
    select orderid, (@counter := @counter +1) as counter,
      round(sum(unitprice * quantity),2) as value
    from order_details
    group by orderid
) sub
order by 2 desc